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Strain Reversal in Actuated Origami Structures.

Steven W Grey1, Fabrizio Scarpa1, Mark Schenk1

  • 1Bristol Composites Institute (ACCIS), Department of Aerospace Engineering, University of Bristol, BS8 1TR Bristol, United Kingdom.

Physical Review Letters
|August 7, 2019
PubMed
Summary
This summary is machine-generated.

Understanding how origami structures deform is key for engineering applications. This study reveals that localized actuation causes strain reversal and elastic spring back in Miura-ori tubes and sheets due to facet bending and in-plane deformations.

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Area of Science:

  • Engineering
  • Materials Science
  • Mechanics

Background:

  • Origami-inspired structures are increasingly explored for deployable and shape-adaptive applications in engineering.
  • Distributed actuators are proposed for controlling deformations in complex origami systems.
  • Knowledge of actuator influence propagation is crucial for designing effective origami-based devices.

Purpose of the Study:

  • To investigate the spatial propagation and decay of localized static actuation in Miura-ori origami structures.
  • To understand the underlying mechanisms of strain reversal and elastic spring back in response to actuation.

Main Methods:

  • Combined experimental testing with finite element analysis (FEA).
  • Utilized reduced-order bar-and-hinge models for simulation.
  • Analyzed strain distribution and deformation patterns in Miura-ori tubes and sheets.

Main Results:

  • Observed a localized strain decay with distance from the actuation point.
  • Identified a significant strain reversal phenomenon.
  • Confirmed elastic spring back to the original configuration away from the actuation site.

Conclusions:

  • Localized actuation in Miura-ori structures results in complex strain patterns, including reversal and spring back.
  • Facet bending is responsible for strain reversal, while in-plane facet deformation drives the spring back.
  • These findings are critical for the precise control and design of actuator networks in origami engineering.